--- Is your father a teacher of English in No. l Middle School? --- No. But he ______ English there for ten years.
#99778
A
has taught
B
has been teaching
C
taught
D
had taught
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The scientist __________ the experiment for half a year, but he _______ yet.
#102041
A
made; didn’t succeed
B
made; hasn’t succeeded
C
was making; didn’t succeed
D
has been making; hasn’t succeeded
All of the guests         by 9 o’clock , but the host        until 15 minutes later .
#104838
A
arrived ; didn’t turn up
B
had arrived ; didn’t turn up
C
arrived ; hadn’t turned up
D
had arrived; hadn’t turned up